Sc3+-Promoted O–O Bond Cleavage of a (μ-1,2-Peroxo)diiron(III) Species Formed from an Iron(II) Precursor and O2 to Generate a Complex with an FeIV2(μ-O)2 CoreClick to copy article linkArticle link copied!
- Saikat BanerjeeSaikat BanerjeeDepartment of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, United StatesMore by Saikat Banerjee
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- Apparao DraksharapuApparao DraksharapuDepartment of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, United StatesMore by Apparao Draksharapu
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- Patrick M. CrosslandPatrick M. CrosslandDepartment of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, United StatesMore by Patrick M. Crossland
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- Ruixi FanRuixi FanDepartment of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United StatesMore by Ruixi Fan
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- Yisong Guo*Yisong Guo*[email protected]Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United StatesMore by Yisong Guo
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- Marcel Swart*Marcel Swart*[email protected]ICREA, Pg. Lluís Companys 23, 08010 Barcelona, SpainIQCC and Department of Chemistry, University of Girona, 17003 Girona, SpainMore by Marcel Swart
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- Lawrence Que Jr.*Lawrence Que, Jr.*[email protected]Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, United StatesMore by Lawrence Que, Jr.
Abstract
Soluble methane monooxygenase (sMMO) carries out methane oxidation at 4 °C and under ambient pressure in a catalytic cycle involving the formation of a peroxodiiron(III) intermediate (P) from the oxygenation of the diiron(II) enzyme and its subsequent conversion to Q, the diiron(IV) oxidant that hydroxylates methane. Synthetic diiron(IV) complexes that can serve as models for Q are rare and have not been generated by a reaction sequence analogous to that of sMMO. In this work, we show that [FeII(Me3NTB)(CH3CN)](CF3SO3)2 (Me3NTB = tris((1-methyl-1H-benzo[d]imidazol-2-yl)methyl)amine) (1) reacts with O2 in the presence of base, generating a (μ-1,2-peroxo)diiron(III) adduct with a low O–O stretching frequency of 825 cm–1 and a short Fe···Fe distance of 3.07 Å. Even more interesting is the observation that the peroxodiiron(III) complex undergoes O–O bond cleavage upon treatment with the Lewis acid Sc3+ and transforms into a bis(μ-oxo)diiron(IV) complex, thus providing a synthetic precedent for the analogous conversion of P to Q in the catalytic cycle of sMMO.
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